Shedding light on dark DNA Most textbook definitions of evolution state that it occurs in two stages: mutation followed by natural selection. DNA mutation is a common and continuous process, and occurs completely at random.
The average adult only eats 15 grams of fiber per day. Women need 25 grams of fiber per day, and men need 38 grams per day, according to the Institute of Medicine.
What is the recommended daily intake of fiber for adults? Answer   35 grams   Answer   According to the American Heart Association, the average American takes in 15 grams of fiber. Several organizations recommend 25 - 30â¦ grams a day. The American Dietetic association recommends 25 - 35 grams a day. If your intake is 15 grams or less and you want to increase your fiber intake, increase it gradually. If you jump from 15 to 35 grams a day, it may cause stomach cramping and gas.